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Comprehension given below is followed by

Question:

Comprehension given below is followed by some multiple-choice questions.

Each question has one correct option. Choose the correct option.

In the modern periodic table, elements are arranged in order of increasing

atomic numbers which are related to the electronic configuration. Depending

upon the type of orbitals receiving the last electron, the elements in the periodic

the table has been divided into four blocks, viz, s, p, d and f. The modern periodic

table consists of 7 periods and 18 groups. Each period begins with the filling

of a new energy shell. In accordance with the Aufbau principle, the seven

periods (1 to 7) have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The

seventh period is still incomplete. To avoid the periodic table being too long,

the two series of f-block elements, called lanthanoids and actinoids are placed

at the bottom of the main body of the periodic table.

(a) The element with atomic number 57 belongs to

(i) s-block

(ii) p-block

(iii) d-block

(iv) f-block

(b) The last element of the p-block in 6th period is represented by the

outermost electronic configuration.

(i) 7s2 7p6

(ii) 5f 14 6d10 7s 2 7p 0

(iii) 4f 14 5d10 6s2 6p6

(iv) 4f 14 5d10 6s 2 6p 4

(c) Which of the elements whose atomic numbers are given below, cannot

be accommodated in the present set up of the long form of the periodic

table?

(i) 107

(ii) 118

(iii) 126

(iv) 102

(d) The electronic configuration of the element which is just above the

element with atomic number 43 in the same group is ________.

(i) 1s2 2s2 2p6 3s2 3p6 3d5 4s2

(ii) 1s2 2s2 2p6 3s2 3p6 3d5 4s3 4p6

(iii) 1s2 2s2 2p6 3s2 3p6 3d6 4s2

(iv) 1s2 2s2 2p6 3s2 3p6 3d7 4s2

(e) The elements with atomic numbers 35, 53 and 85 are all ________.

(i) noble gases

(ii) halogens

(iii) heavy metals

(iv) light metals

Solution:

(a) Option (iii) is the answer

(b) Option (iii) is the answer

(c) Option (iii) is the answer.

(d) Option (i) is the answer

(e) Option (ii) is the answer

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